My friend can visit my island but I can't visit hers. Help?

Whenever I've encountered this issue with a specific friend it is usually fixed by one of us resetting our router.
 
I'll run this down quickly. She can visit my island. My other friends can visit my island. They can visit her island. But for whatever reason, I can't visit her island as I'm always hit with an "unable to connect to other consoles". Is there a fix go this? I'm very confused, as she's the only person I have experienced this with and my other friends can easily visit her island.
The same thing is happening to me, did you find a way to fix it?
 
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